Combined crowding and staking tool for watchmakers



J. I. HANSEN Feb. 23, 1937.

COMBINED CROWDING AND STAKING TOOL FOR WATCHMAKERS Filed May 4, 1936 WI/lmrvii [W ENTOR. Wag-Em ATTORNEY.

Patented Feb. 23, 1937 UNITED STATES PATENT OFFICE COMBINED CROWDING AND STAKING TOOL FOR WATCHMAKERS 6 Claims.

This invention relates to a special tool for watchmakers and relates more particularly to a tool for removing and replacing friction jewels and bushings in watch movements. It is the modern practice in watchmaking to employ jewels mounted in a sleeve or bushing designed to be pressed into a receiving opening in the watch plate with suflicient pressure to frictionally maintain themselves in place without the use of screws.

The usual watchmakers staking tool is designed to be struck with a hammer and when used on friction jewels, is not satisfactory. The disadvantage of the usual staking tool is that it is impossible to judge the strength of the hammer blow, and it is therefore difficult to drive a friction jewel bushing to exactly the proper position. If it is driven too far, the plate must be reversed and the jewel driven back. After several attempts, it might be finally perfectly located.

The principal object of the present invention is to provide a staking tool which can be used for the usual purposes of such a tool and also used for micrometric crowding or pushing, so that a friction jewel bushing may be removed or accurately pushed into place without the use of a hammer and without scratching or damaging the bushing.

Another object of the invention is to so construct the device that should it be desired to use the tool with a hammer for the usual staking operations it may be so used without interfering with the accurate crowding or pushing feature thereof.

A further object is to so construct the tool that it can make use of the usual watchmakers staking tool, punches and stumps, thereby making the purchase of additional punches unnecessary.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efliciency. These will become more apparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a perspective view illustrating the invention ready for use as an ordinary staking tool.

Fig. 2 is a vertical section therethrough, taken on the line 2-2. In this view the tool is set up for a crowding or pushing operation.

Fig. 3 is a detail horizontal section, taken on the line 33, Fig. 2.

Fig. 4 is a detail view of the cap member employed for converting the tool from a staking tool to a crowding tool. 5

Fig. 5 is a detail view of a typical Watchmakers stump of the type which may be employed with the invention.

The improved staking and crowding tool employs a base Ill above Which a curved, punch- 10 holding standard I! projects. The top of the base I!) is formed with a flat work table 12 drilled as shown at 5 to receive the usual watchmakers stump [3. These stumps of course are furnished in various sizes with various bores. The stand- 15 ard I I terminates immediately over the stump [2 in a horizontally slottedvertically drilled extremity M. The vertically drilled hole is positioned accurately over the stump socket iii.

A threaded punch tube It passes vertically :2.) through the extremity I4 and is supported therein in an adjusting nut H. The nut I! is accurately held in place by the horizontal slot and it is accurately threaded to receive the threaded tube It. The tube It is prevented from rotating 2.) by means of a set screw or pin 23 which enters a vertical keyway IS in the threaded tube. The lower extremity of the sleeve [6 is tapered and slotted to form a spring chuck I9. The internal diameter of the sleeve 86 is such as to slidably 39 receive one of the usual watchmakers punches, such as indicated at 20. The resiliency of the chuck I9 is such as to cause it to frictionally engage the punch 20 to hold it in any desired suspended position therein.

As thus far described, the device may be used as the usual staking tool. That is, the work may be placed upon the stump l3 and the punch 20, the upper extremity of which projects above the tube l1, may be struck with a hammer to do any desired staking work.

To convert the tool into a crowding tool, a cap 2| is provided. The cap is internally threaded so that it may be screwed upon the upper extremity of the sleeve It so that its interior will engage the upper extremity of the punch 20.

With the cap in place, it can be readily seen that if the nut I! is rotated, it will cause the cap to push or crowd the punch downwardly toward the stump I3, with any desired degree of pressure. Reversal of the nut l1 causes the spring chuck 99 to raise the punch. It is preferred to mark the top of the nut H with a micrometer index 22 so that the operator may move the punch 20 55 downwardly any predetermined degree of distance.

It can be readily seen that, with a watch plate resting on the stump l3 and a friction jewel positioned over the jewel opening in the plate, the operator can by rotation of the nut 22 gently crowd the jewel into its opening. If he knows in advance the length of the jewel bushing, he can by watching the graduations 22, know when he has forced the jewel to an exactly flush position. The punches 20 and the stumps l3 are of course interchangeable as in the usual staking tool.

Arbor press clamps etc. have been designed so that by rotating a screw, pressure may be exerted. Such a press is unsatisfactory for the present purpose since the lower extremity of their punch must rotate and in rotating it will scratch or mar the jewel bushing. It is desired to call attention to the fact that in the present invention there is no frictional movement between the punch and jewel bushing so that the latter is not marred or damaged in any way.

It is desired to call particular attention to the micrometer scale 22. This scale is positioned on the top of the knurled nut I! so that it is not interfered with by the fingers of the operator, and is readily visible when in use. An indicating point 24 is provided for reading the index 22.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent 1. A watchmakers tool comprising: a supporting frame; a work table in said frame; an arm extending over said work table; a bifurcated extremity on said arm; a nut positioned in said bifurcated extremity; a vertical threaded tube passing through said extremity and through said nut and threaded into the latter; a punch slidably mounted in said threaded tube; means for preventing upward movement of said punch in said tube; an index scale on the upper face of said nut; a point cooperating with said scale to indicate the amount of rotation of said nut; and means for preventing said tube from rotating in said extremity.

2. A watchmakers tool comprising: a supporting frame; a work table in said frame; an arm extending over said work table; a bifurcated extremity on said arm; a nut positioned in said bifurcated extremity; a vertical threaded tube passing through said extremity and through said nut and threaded into the latter; a punch slidably mounted in said threaded tube; means for preventing upward movement of said punch in said sleeve; an index scale on the upper face of said nut; a point cooperating with said scale to indicate the amount of rotation of said nut; means for preventing said tube from rotating in said extremity; and friction means on said tube for engaging said punch to hold the latter in position.

3. A combined staking tool and press for watchmakers comprising: a base; means for supporting a stump in said base; a standard extending over said stump; a vertical, threaded tube in said standard over said stump; a punch extending through said tube; an adjusting nut threaded on said tube so that rotation thereof will move said tube vertically; a resilient clutch on the lower extremity of said tube for preventing downward movement of said punch; and means for preventing said punch from moving upward in said sleeve.

4. A combined staking tool and press for watchmakers comprising: a base; means for supporting a stump in said base; a standard extending over said stump; a vertical, threaded tube in said standard over said stump for receiving a punch; an adjusting nut threaded on said tube so that rotation thereof will move the latter vertically; and a cap member threaded onto said tube and closing the upper extremity thereof so that downward movement of said tube will cause said cap to contact said punch to force the latter downward.

5. A watchmakers tool comprising: a supporting frame; a work table in said frame; an arm extending over said work table; a bifurcated extremity on said arm; a nut positioned in said bifurcated extremity; a vertical threaded tube passing through said extremity and through said nut and threaded into the latter; a punch slidably mounted in said threaded tube; means for preventing upward movement of said punch in said tube; and means for preventing said tube from rotating in said extremity.

6. A watchmakers tool comprising: a supporting frame; a work table in said frame; an arm extending over said work table; a bifurcated extremity on said arm; a nut positioned in said bifurcated extremity; a vertical threaded tube passing through said extremity and through said nut and threaded into the latter; a punch slidably mounted in said threaded tube; means for preventing upward movement of said punch in said tube; means for preventing said tube from rotating in said extremity; and friction means on said tube for engaging said punch to hold the latter in position.

JES I. HANSEN. 

